OM System
OM-1 II
Flagship MFT with stacked sensor, 120fps, and pro wildlife features.
$2,399
Released Feb 2024
OM System
OM-3 ASTRO
Astrophotography-focused OM-3 variant with 20.4MP stacked sensor, H-alpha-friendly filter tuning, IP53 sealing, and 7.5-stop Sync IS.
$2,499
Released Jul 2025
OM-3 ASTRO is 1.4 years newer.
Wins
OM-1 II
Wins
OM-3 ASTRO
13 categories tied
TL;DR — Key differences
- AOM-1 II has higher EVF resolution (5,760,000 vs 2,360,000)
- AOM-1 II has higher IBIS effectiveness (8.5 stops vs 6.5 stops)
- BOM-3 ASTRO has higher Battery life (CIPA) (640 shots vs 520 shots)
- BOM-3 ASTRO has lower Weight (496 g vs 599 g)
Key specs at a glance
Size and weight, to scale
OM-1 II
135 × 92 × 73 mm
599 g (1.32 lb / 21.13 oz)
OM-3 ASTRO
139 × 89 × 46 mm
496 g (1.09 lb / 17.50 oz)
OM-1 II is 5mm narrower than OM-3 ASTRO but it is also 3mm taller and 27mm thicker.
OM-1 II is 103 g heavier than OM-3 ASTRO.
Depth (front-to-back): 73mm OM-1 II · 46mm OM-3 ASTRO
Sensor size, to scale
OM-1 II
17.4 × 13 mm · Compact / large-type
226 mm² area
OM-3 ASTRO
17.4 × 13 mm · Compact / large-type
226 mm² area
Lens ecosystem
Native lens selection
OM-1 II
✓ more lensesMicro Four Thirds
130+
native lenses available
OM-3 ASTRO
✓ more lensesMicro Four Thirds
130+
native lenses available
Counts include current first-party and major third-party native autofocus lenses.
Use-case scoring
Which one for what?
Algorithmic scores from verified specs · 10 = best in class
Why pick one over the other
Reasons to choose
OM-1 II
Dimensions (W×H×D mm)
Adds 134.8, 91.6, 72.7
EVF resolution
5,760,000 vs 2,360,000 — higher is better
IBIS effectiveness
8.5 stops vs 6.5 stops — higher is better
Reasons to choose
OM-3 ASTRO
Dimensions (W×H×D mm)
Adds 139.3, 88.9, 45.8
Battery life (CIPA)
640 shots vs 520 shots — higher is better
Weight
496 g vs 599 g — lower is better
Both cameras share
- ✓Resolution — Both 20.4 MP
- ✓ISO min (native) — Both 80
- ✓ISO max (native) — Both 102,400
- ✓AF points / zones — Both 1053
- ✓AF frame coverage — Both 100 %
- ✓Eye AF — Both support eye af
Pros & cons at a glance
Editorially curated highlights and trade-offs.
OM-1 II
Pros
- ✓120fps stills
- ✓Stacked MFT
- ✓IP53 weather sealing
- ✓Computational features
Cons
- –MFT sensor size
- –Smaller ecosystem
- –Menu complexity
OM-3 ASTRO
Pros
- ✓Astro-tuned sensor filter
- ✓20.4MP stacked BSI Live MOS
- ✓IP53 weather sealing
- ✓7.5-stop Sync IS
Cons
- –Specialized astro variant
- –Micro Four Thirds sensor
- –Premium price
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for travel, OM-1 II or OM-3 ASTRO?
OM-3 ASTRO scores 8.0/10 versus 7.0/10 for OM-1 II — 496g — ultralight for all-day carry.
What's the resolution difference between the OM-1 II and OM-3 ASTRO?
Both cameras share the same 20.4 MP resolution.
Do the OM-1 II and OM-3 ASTRO have in-body image stabilization?
OM-1 II has 8.5-stop in-body image stabilization, while oM-3 ASTRO has 6.5-stop in-body image stabilization.
Which shoots faster bursts — the OM-1 II or the OM-3 ASTRO?
OM-1 II reaches 120 fps electronic. OM-3 ASTRO reaches 120 fps electronic.
What's the weight difference between the OM-1 II and OM-3 ASTRO?
OM-1 II weighs 599 g and OM-3 ASTRO weighs 496 g, so the OM-3 ASTRO is 103 g lighter.
Do the OM-1 II and OM-3 ASTRO record 4K video?
OM-1 II: 4K up to 60p. OM-3 ASTRO: 4K up to 60p.
Are the OM-1 II and OM-3 ASTRO weather sealed?
OM-1 II: Yes. OM-3 ASTRO: Yes.
Which has better battery life?
Rated battery life is 520 shots (CIPA) for the OM-1 II and 640 shots for the OM-3 ASTRO, giving the OM-3 ASTRO the edge.
How much does each cost?
OM-1 II launched at $2,399 and OM-3 ASTRO at $2,499. The OM-1 II is $100 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.